Библиографическое описание:Геолого-минералогическая и геохимическая зональность Mo-Au-Cu-порфирового месторождения Ак-Суг, северо-восточная Тува, Россия : научное издание / К. В. Лобанов [и др.]. - Текст : непосредственный // Геосферные исследования. - 2023. - № 3. - С. 28-51. - Исследование выполнено при финансовой поддержке РФФИ, Правительства Красноярского края, Краевого фонда науки и Акционерного общества «Корпорация развития Енисейской Сибири» в рамках научного проекта № 20-45-242903. - ISSN 2542-1379. - ISSN 2541-9943, DOI 10.17223/25421379/28/3.
Аннотация:Проведено комплексное изучение крупного Mo-Au-Cu-порфирового месторождения Ак-Суг, расположенного в геологических структурах Восточного Саяна в зоне влияния регионального Кандатского разлома. На основе обобщения информации, накопленной за весь период изучения месторождения и анализа новых данных, уточнены главные особенности его геологического строения, а также создана модель геолого-минералогической и геохимической зональности. Вклад авторов: все авторы сделали эквивалентный вклад в подготовку публикации. Авторы заявляют об отсутствии конфликта интересов.
A comprehensive study of the large Mo-Au-Cu porphyry Ak-Sug deposit, which belongs to the East Sayan metallo-genic province, was carried out. The deposit area belongs to the mountainous country of the East Sayan of the Altai-Sayan folded region and is located in the conjugation zone of the East Tuva and Kizir-Kazyr folded systems, separated by the regional Kandat fault. The geology of the deposit is determined by the structure of the Ak-Sug intrusion, represented by successively intruded rocks from diorites and quartz diorites of early phases to tonalite-porphyry and plagiogranite-porphyry at the later stage of intrusive magmatism. Based on the information accumulated over the entire period of the study of the deposit, models of geological, mineralogical, geochemical zoning were created. The geochemical halos of most ore elements are controlled by the orebearing phases of the Ak-Sug intrusion - tonaliteporphyry and plagiogranite-porphyry and form a ring structure around the "quartz core" formed as a result of metasomatic silicification of the parent rocks, which is a typical pattern for porphyry copper deposits. Hydrothermal alteration of host rocks has a similar ring zonal structure and varies from the periphery to the center from propylite (Propylitic) to quartz-sericite-chlorite (Phyllitic) and chlorite-sericite metasomatites (SCC). Areas of potassium metasomatism are locally reflected in the zone of quartz-chlorite-sericite changes in the central part of the deposit. K-feldspathization is presented as several disjointed halos forming a semicircle to the east of the "quartz core". The zone of hydrothermal biotitization is manifested to the north of the "quartz core", which is one of the main indicators of potassium metasomatism along with metasomatic potassium feldspar. The zonal distribution of ore minerals is manifested by ring halos of pyrite distribution (in the propylitization zone), pyrite with chal-copyrite and molybdenite in the central part of the deposit. Linearly elongated zones of chalcopyrite and bornite-chalcopyrite mineralization are manifested coinciding with biotite development halos in its northern part. A similar location to the north of the "quartz core" is noted for fahlore mineralization, most often represented by arsenic copper sulfosalt - tennantite. Factor analysis revealed 8 isolated associations of chemical elements (host rocks - Al-V-Ti-Mg-Ga-Sc-Y-Na; pyrite - Fe-Co-S; polymetallic -Zn-Cd-Pb; rare earth - Ce-La-Y-P; sulfosalt - Sb-As-(Hg); low-temperature carbonate with barite - Ba-Sr; molybdenum - MoRe). Each of the associations corresponds to certain mineral parageneses occurred during the formation of the Ak-Sug molybdenum-copper porphyry deposit. The variability of the associations of elements is shown along the dip of the ore zone and along the lateral, as well as the possibility of an increase in reserves to the depth and on its western flank. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.
